Help im haveing family problems?

well ive been liveing with my sister since feb time i moved out of my old flat coz the landlord kept putting the rent up and up till i couldent afford it so i just had to move and im thankfull my sister moved me in but ever since i moved in its been a liveing hell for me and now its getting to the stage where i dont know who my sister is enymore she just treats me like **** all the time thinks she can just say what she wants to me and her bf thinks he can do the same thing and at this time im getting so upset and depressed i carnt handel it enymore everytime i get payed they are like to vultures wanting a big chunk out of my cash like 50pound and it aint fair to me coz i only get 130 from esa they allways talk behind my back in a way i think there jellous coz i dont have a child and im single can do as i plaese i mean the other day they went out and left me looking after her child they came bk and never said thanks or give me eny cash is that fair .. i donk think so my sister sold me a laptop that im buying of her for 150pound and it dosent work runs realy slow crashes all the time and im getting it fixed for 35pound so that means im paying more for it thats pissing me off and i just fell like im aint wanted everyday im crying most times coz no 1 helps me i just need some advise please ....thanks so much